Top Nuclear Reactor Construction Companies

The global nuclear reactor construction industry is traditionally dominated by major players like Rosatom, EDF, GE Hitachi, and Westinghouse. However, the entry of innovative startups is reshaping the competitive dynamics by introducing advanced technologies, new business models, and modular solutions. These emerging companies are particularly active in the development of Small Modular Reactors (SMRs) and next-generation nuclear solutions that emphasize safety, scalability, and sustainability.

The nuclear reactor construction market is undergoing a dynamic transformation as traditional energy demands converge with modern technological innovation and sustainability goals. Historically led by major corporations and government-backed entities, the market is now witnessing a surge of innovation from agile startups entering the space. These emerging companies are challenging the status quo with next-generation reactor designs, especially in the domain of small modular reactors (SMRs) and microreactors.

• Last Energy: Founded in 2018 and based in Washington, D.C., Last Energy is a pioneering startup focused on transforming the way nuclear energy is deployed globally. Its main objective is to commercialize small modular nuclear power plants (SMRs) that are quick to deploy, scalable, and economically viable. The company designs factory-manufactured, containerized SMR units that can be installed in under two years, significantly reducing the construction time and financial barriers typically associated with nuclear projects. In 2024, Last Energy secured key agreements across Europe to deploy its 20 MWe reactors, signaling strong market interest in decentralized, efficient nuclear energy solutions.

• Radiant Industries: Established in 2018 in El Segundo, California, Radiant Industries aims to bring clean, portable nuclear energy to remote and off-grid locations. The startup's core mission is to develop advanced microreactors that are safe, transportable, and capable of providing consistent power in areas where traditional infrastructure is limited. Using gas-cooled reactor technology and high-assay low-enriched uranium (HALEU), Radiant is positioning itself as a key player in mobile nuclear solutions. The company has drawn support from both private investors and the U.S. Department of Defense, and by 2024, it had successfully advanced its prototype testing phase, drawing attention for its potential use in defense, emergency response, and rural electrification.

Top Player’s Company Profile

• Rosatom

• Westinghouse Electric Company

• GE Hitachi Nuclear Energy

• EDF Energy

• China National Nuclear Corporation (CNNC)

• Mitsubishi Heavy Industries

• Framatome

• AECOM

• Doosan Heavy Industries & Construction

• Babcock & Wilcox

• Ansaldo Nucleare

• KHNP